Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Schedule Of Weighted Average Assumptions For Restricted Stock Units) (Details)

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Stock-Based Compensation (Schedule Of Weighted Average Assumptions For Restricted Stock Units) (Details) - Restricted Stock Units [Member] - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period, years 2 years 7 months 23 days 3 years 6 months 21 days 3 years 9 months 25 days 3 years 10 months
Expected annual dividend yield 1.05% 1.34% 1.14% 1.33%
Estimated average grant date fair value per restricted stock unit (in dollars per share) $ 55.80 $ 39.91 $ 51.01 $ 39.08